|  | <!doctype html> | 
|  | <title>cross-document channel</title> | 
|  | <script src="/resources/testharness.js"></script> | 
|  | <script src="/resources/testharnessreport.js"></script> | 
|  | <iframe src=004-1.html></iframe><iframe src=004-2.html></iframe> | 
|  | <div id="log"></div> | 
|  | <script> | 
|  | var t = async_test(); | 
|  | onload = t.step_func( | 
|  | function() { | 
|  | var channel = new MessageChannel(); | 
|  | window[0].postMessage(1, '*', [channel.port1]); | 
|  | window[1].postMessage(2, '*', [channel.port2]); | 
|  | channel = null; | 
|  | window.onmessage = t.step_func( | 
|  | function(e) { | 
|  | assert_equals(e.data, 1); | 
|  | t.done(); | 
|  | }); | 
|  | } | 
|  | ); | 
|  | </script> |